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The weekly salary paid to employees of a small company that supplies part-time labourers averages $700 with a standard deviation of $400.
a.) If the weekly salaries are normally distributed, estimate the fraction of employees that make more than $300 per week.
b.) If every employee receives a year-end bonus that adds $100 to the pay check in the final week, how does this change the normal model for that week?
c.) If every employee receives a 5% salary increase for the next year, how does the normal model change?
d.) If the lowest salary is $300 and the median salary is $500, does a normal model appear appropriate?
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Compute the mean, standard deviation, median, and standard error for each group.
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What is the probability that at least one of the 40 shuttle missions scheduled over the next 5 years results in a critical-item failure?
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Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
Based on a scatter diagram, would you estimate the linear correlation coefficient to be:
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Crete a 90% confidence interval for mean Secchi dish measurement.
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The national average SAT score (for Verbal and Math) is 1028. If we assume a normal distribution with σ = 92, what is the 90th percentile score? What is the probability that a randomly selected score exceeds 1200?
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